Connector, battery and electric device

The utility model discloses a connector, a battery and an electric device. The connector of the present application comprises: a housing; a power connection terminal, wherein a part of the power connection terminal is inserted into the shell; and the insulating part is connected with one end of the shell and is arranged on the power connection terminal in a sleeving manner, and a bulge is formed on the peripheral surface of the insulating part and extends along the circumferential direction of the insulating part. When the connector is used in some environments, water may drop on the outer peripheral surface of an insulating part of the connector, and the water can form a continuous path on the outer surface of the connector to cause insulation and voltage resistance failure of the connector. According to the connector, the protrusions are arranged on the peripheral surface of the insulating part and extend in the circumferential direction of the insulating part, and when water is formed on the peripheral sur